Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c8855a125b5fb0…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 23:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a80a9ec98d4a20f27ab75002a6d29a77 SHA-1: 99fc9025eecd0455595b88badac4e4d3cb7c08cb SHA-256: c2c8855a125b5fb07a2a1e652a4c2403bff9896dbdccdcd0f663a21e97ceb7f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with many pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=ww2+plane+games+android PDF link annotation
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/84490086201.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/liduzubadazivunopo.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/97093975018.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/11198731641.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/mufolowek.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/vukamisonebeganinesomijen.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/40722334412.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/57194363063.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bonofadefu.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/bixezidoligez.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/60668294282.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091213050273499.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/9603427239.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137805378bf4---59968339849.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fuzojipamowagavolufavuwe.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/pitobikonobasefemilovaxa.pdfIn PDF document text
    • http://erex.hu/upload/file/gaketofezurunazupadego.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/40970588594.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/womimur.pdfIn PDF document text
    • http://zuszdounky.cz/files/67976544197.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/59138454104.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614456f4db645---13837267586.pdfIn PDF document text
    • http://ukrfirework.com/images/file/41176672134.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/bajonusezulinikubanebode.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/bemuzefewudotelefipimode.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16960 bytes
SHA-256: e5a8a58b89b228a01ec3b9ab914a94e791e67189141fe3f1633becb09dc1933f
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 10836 bytes
SHA-256: d39d01041ffb6cb064d7634839bbb380778a06bd92f189b0319e50fb79f6e238